Angle of view of a camera lens across the diagonal of 35 mm film

Name: Angle of view of a camera lens across the diagonal of 35 mm film
Creator: Unlabeled
License: CC-BY-SA 4.0

A 50 mm lens takes in 47° from corner to corner of a 36 × 24 mm frame, a 100 mm lens 24° and a 200 mm lens 12°: from 50 mm on, double the focal length and the view narrows to about half.

What does this axis measure?

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y ↑: Angle of view (degrees)
x →: Focal length (mm)

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The data: 23 points

Focal length (mm)	Angle of view (degrees)
14	114.2
16	107
18	100.5
20	94.5
22	89
24	84.1
26	79.5
28	75.4
30	71.6
35	63.4
40	56.8
45	51.4
50	46.8
60	39.7
70	34.3
80	30.3
90	27
100	24.4
120	20.4
140	17.6
160	15.4
180	13.7
200	12.3

Source: Computed: angle of view = 2 arctan(d / 2f), with d the diagonal of the 36 × 24 mm frame (Wikipedia, Angle of view (photography)) via Ernest McCollough, Photographic Topography, Industry: A Monthly Magazine Devoted to Science, Engineering and Mechanic Arts, 1893, pages 399-406
Licence: CC-BY-SA 4.0
Read: 2026-09-29
Drawn: 23 points as the puzzle showed them · line

Ran in puzzle #26 on October 22, 2026. Play it

Angle of view of a camera lens across the diagonal of 35 mm film

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